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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edccae969ae7ed33e7eb9a0e407721aaee5c4ca90169b836de3d488f04f01418' 
  AND token = 'sOAbui4wdLveDS2L4yrezb7fAzWAXH2RSIM7FIW5dFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}